As far as Jet 2 are concerned they will probably have to type rate people as there is not a load of type rated classic 737 people on the market.
Are you telling me that if a type rated 757 ex Astreus applies that they won't look at them?
What do Jet2 charge for type rating somebody?
If an airline decides to spend money on type rating somebody when there is just as good a type rated pilot on the market then they are fiscally inept!